Haih sabar ye, cycle yang unpredictable mcm ni memang stress kan, a few of us TTC friends pun pernah dalam situasi cycle panjang yang confusing gak. Since your ultrasound shows kosong and HPT negative but your body signs are so mixed (the rash suddenly muncul especially), I'd really suggest check with your doctor again lah before deciding on the medication, maybe the rash is a clue ke ada other hormonal things happening, bukan just cycle je. For the "should I wait or take medicine" part, honestly it depends on how long you're willing to wait and what your doctor thinks might be the root cause (bisa be anovulatory cycle, bisa be other things), the safest is to discuss the pros and cons with your doctor based on your TTC timeline. Sending you calm energy, 1.5 years is a journey and you're not alone in this!